tsina+tcosa=t(√2(sina*√2/2+cosa*√2/2))=√2t sin(a+π/4)
标签:tsina,tcosa,等于
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tsina+tcosa=t(√2(sina*√2/2+cosa*√2/2))=√2t sin(a+π/4)
标签:tsina,tcosa,等于